The "advice" on this thread is getting pretty far-fetched. I implore all the responders to first re-read the OP's comments about never having added anything to the pool except bleach.....that sorta' makes copper a non-issue.
Secondly, I have seen pools (mostly mine) with mustard algae, green algae and mixtures and ratios of all kinds of algae......they never look like the pictures the OP has provided us. A reasoned study of the info available also details to us a very, very low FC loss.......a pool with enough algae to discolor a pool will consume chlorine far, far faster than OP indicates is happening.
I cannot, yet, resolve the problem with this pool water. Back to the principles of BBB, we simplify everything we can and we test carefully to make the appropriate adjusments. This pool seems outside the normal parameters for which we test.......making it seem only logical that what's involved is a parameter for which we do not test. Just what that parameter is.....I don't know.
Secondly, I have seen pools (mostly mine) with mustard algae, green algae and mixtures and ratios of all kinds of algae......they never look like the pictures the OP has provided us. A reasoned study of the info available also details to us a very, very low FC loss.......a pool with enough algae to discolor a pool will consume chlorine far, far faster than OP indicates is happening.
I cannot, yet, resolve the problem with this pool water. Back to the principles of BBB, we simplify everything we can and we test carefully to make the appropriate adjusments. This pool seems outside the normal parameters for which we test.......making it seem only logical that what's involved is a parameter for which we do not test. Just what that parameter is.....I don't know.